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Blank monitor

My mother's Desktop seems to be having problem after problem. She's had to bring in her computer to the geek squad quite a few times for motherboard problems. She's had the motherboard replaced a few times because the screen would freeze up and also randomly shut down.

But as of recently the current problem is when you go to start her computer up the monitor just stays blank. Thinking it may have been just the monitor or monitor cord I tested it out on another computer and it worked fine. Yesterday it was working, although the black screen before the desktop showed seemed to take a bit longer to show then usual. And then today nothing.

Can someone please give some advice on what may be going on and what I should do?

She owns a HP pavilion a6514f and has Windows Vista.

Also don't know if this helps any but yesterday when it was working certain sites wouldn't load.

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I have a feeling that either your video card drivers are corrupt, or your motherboard's monitor port (is it HDMI, VGA, etc, please tell me) broken. Also, certain sites not loading can just be server issues with the site, such as when sites are being updated (or DDoS'd.)

Also, what size is the hard drive in terms of physical size? If it's 3.5", which is the standard for most desktops, you can plug the drive into another desktop computer, if anything to make sure the operating system is still intact.

Also, one last thing, when you start the computer, do you see even the POST screen (the screen where it says Hewlett Packard or HP when you first push the power button?)